How to transfer Exchange by Ovh to Exchange by Microsoft ?

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How to transfer Exchange by Ovh to Exchange by Microsoft ?

Galerie PLURIELLE 0

2 answers

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Answer 1

Kudos-Ng 14,515 Microsoft External Staff Moderator

Hi Galerie PLURIELLE,

Thank you for posting your question in the Microsoft Q&A forum.

I would like to clarify a few things to better assist you:

Do you already have a Microsoft 365 tenant and the appropriate Exchange Online licenses set up?
Do you need to migrate your historical email data (emails, contacts, calendars) from OVH Exchange to Microsoft Exchange Online, or do you only need to point your domain's DNS records to Microsoft 365?

In the meantime, if your goal is to configure your OVH-hosted domain to work with Microsoft 365, Microsoft provides a step-by-step guide on how to create the necessary DNS records (MX, CNAME, TXT/SPF, etc.) at OVH. You can find it here: Connect your DNS records at OVH to Microsoft 365.

Looking for your input.

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Galerie PLURIELLE 0 Reputation points

2026-02-23T12:12:35.5533333+00:00

Thank you for your responsiveness and requests for clarification, to which I am responding:

I already have a Microsoft 365 tenant , but not yet the appropriate Exchange Online licenses set up. I need to migrate my historical email data (emails, contacts, calendars) from OVH Exchange to Microsoft Exchange Online.

Waiting for your help,
Kudos-Ng 14,515 Reputation points Microsoft External Staff Moderator

2026-02-24T11:24:00.7933333+00:00

Hi Galerie PLURIELLE,

Thanks for your quick follow up.

I have researched this specific scenario regarding migrating from OVH Exchange directly over to Microsoft 365 Exchange. Currently, there is no single, fully automated, native path supported by Microsoft that handles this specific tenant-to-tenant migration natively from a third-party host like OVH.

However, there are a couple of approaches you can take depending on the size of your organization and what data you need to move:

1) IMAP Migration (Native M365 Tool)

Microsoft provides a built-in IMAP migration tool in the Exchange Admin Center. This allows you to sync emails directly from the OVH servers to the new Microsoft 365 mailboxes. While this is a somewhat automated process, the IMAP protocol only supports migrating emails. It cannot migrate your calendars, contacts, or tasks.

2) PST Export and Import (Manual Approach)

If you need to ensure calendars, contacts, and all folder structures are moved over intact, the most common workaround is utilizing PST files. You would need to export the data from each individual OVH mailbox into an Outlook Data File (.pst).
Note: This information is provided as a convenience to you. These sites are not controlled by Microsoft, and Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please ensure that you fully understand the risks before using any suggestions from the above link.

Once exported, you can import these PST files into the new M365 mailboxes using the Microsoft Purview Network Upload method or manually via the Outlook desktop client. This method migrates all of your data, but it requires a lot of manual effort (exporting, downloading, and re-uploading). Because of the time and bandwidth required, this approach is usually only recommended and suitable if you don't have too many mailboxes to move.

Hope this helps clarify your options for the move.
Kudos-Ng 14,515 Reputation points Microsoft External Staff Moderator

2026-02-25T13:02:29.47+00:00

Hi Galerie PLURIELLE,

Just checking in to see if you had a chance to review the previous response.

Your feedback would be very helpful in ensuring everything is on track.

Answer 2

To transfer your email services from OVH Exchange to Microsoft Exchange, you will need to follow a series of steps to ensure a smooth migration. Here’s a general outline of the process:

Prepare Your Microsoft 365 Account: Ensure that you have a Microsoft 365 account set up and ready to receive emails.
Backup Your Data: Before making any changes, back up your existing emails, contacts, and calendar items from your OVH Exchange account.
Update DNS Records: You will need to update your DNS records to point to Microsoft’s servers. This typically involves adding MX records, CNAME records, and possibly TXT records for SPF to help prevent email spam. You can find detailed instructions on how to add these records at OVH in the Microsoft documentation.
Migrate Mail Data: Use a migration tool or service to transfer your emails from OVH to Microsoft Exchange. This may involve exporting your emails from OVH and importing them into Microsoft 365.
Test the Setup: Once the DNS changes have propagated, test your email to ensure that it is functioning correctly with Microsoft Exchange.
Decommission OVH Exchange: After confirming that everything is working as expected with Microsoft, you can decommission your OVH Exchange account.

For detailed steps on how to add DNS records at OVH for Microsoft 365, you can refer to the Microsoft documentation.

References:

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How to transfer Exchange by Ovh to Exchange by Microsoft ?

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